How many polypeptide chains does a T-cell receptor have?
A) 1
B) 2
C) 3
D) 4
B
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A glass greenhouse on the south side of a building is an example of
A. An active solar heating system B. Passive heat absorption C. Parabolic collection D. Charging fuel cells to increase efficiency in energy use E. Cogeneration
Read carefully through the following sentence and decide which of the options is correct. Analysis of
sea surface temperatures in the Indian Ocean indicates that changes in land-use practices in the Sahel of Africa were sufficient to cause desertification. a. The word "temperatures" should be replaced by "salinities." b. The word "Indian" should be replaced by "Atlantic." c. The word "land-use" should be replaced by "farming." d. The word "sufficient" should be replaced by "insufficient." e. The word "desertification" should be replaced by "drought."
Which of these are present in an element's nucleus?
A. electrons and protons B. neutrons C. neutrons and protons D. electrons
All of the following are ways in which states shape economies EXCEPT
A) creation and enforcement of laws. B) setting fiscal and monetary policy. C) through its uneven expenditures across the landscape. D) construction of infrastructure. E) through military intervention.